Amplifier for talking-machines.



J. M. EVANS. AMPLIFIER FOR TALKING MACHINES. APPLICATION FILED r23. 25, 1911. RENEWED JAN. 16, 1912.

I Patented Aug.20,1912.

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Jar/mes J)Z Eva/nix b i h-0.12am 1% enr rst AJES M. EVANS, OF WESTPORT, CONNECTICUT.

AMPLIIEIER FOB TALKING-MACHINES.

mg yy I Specification oflLetters Patent. I Ijatented Aug". 20, 1912.

Application filed February 25 1911, Serial No. 610,88 2. Renewed January 16, 1912. Serial No. 671,5It lf To dl l ibiiiirh'ztinagj con card: or bar in the case, and the inner tnot re- 55 Be it known that I, JAMES M. EvA s, c 1 t1 l ed upon for vibration) rests. at its outer Zen of the United States, residing at WVestedge, on the annular base of the casing. By

port, Connecticut, have invented certain reason of this continually expanding space new-and useful-Improveinents 1n Amplifiers between walls which correspond in shape ing is a specification. brating air therein, the interference and (118- f My'said-invcntion relates mainly to ampli-' tortion of sound waves are diiiiinished and tiers of sound reproducing or talking me, the tone improved. x chines, its object being to deliver the ampli jf This construction admits, as shown in tied. sound waves with uniform and equal' Fig. 1, of a lateral'dischargefat allpoi'nts 65 distribution and without interference or; and equally into the atmosphere. It also distortion, into the surroundingatmosphere; {admits of a shorter or lower instrument, The form of amplifier which I have devised Ewithout protruding horn. It also, in the for these purposes also is well adapted to 'construct-ion and organization of the appaform of musical instrument at once compact 'j ratus, locates the sound producing devices -70 and convenient, and susceptible of ornafl at the inlet end of the amplifier, and leaves ment-ation. @the discharge end unobstructed'without sac- I It is illustrated in the accompanyin ifice of compactness. This construction drawings, in which, "'3 also (as it includes the motor within the Figure 1 shows a central vertical sectiong ijacketed space of the bells) deadens the 75 of the instrument; and Figs. 2 and 3 ele j. sound of themoto'r, as well as conceals it, in rations of details. l gspace otherwise unused.

InFzigQ-"IatAisjindicated the wall of'af Figs. 2 and 3 show more clearly the cylindrical case, which incloses the main {swiveled joint of the tone arm.

part-of theapparatus. In its upper part is F. I claim: a shown the turn table I), mounted on its 1. In a talkin machine, an amplifier com-' rcrticalshaft, which'isrotated by-anysuitf-posed of two daring shells or walls, one able motor, locatedin the space F, within: within the other, providinga space between:

the inner shell of the amplifier. The case, the inner faces of the walls extending has a cover B, and beneath it is shown the Lthroughout the length of the amplifier, said 85 ordinary sound box C, on the end of a tone, jwalls being arranged in relation to each arm made in two parts, E and E, swiveledj tether to act upon the sound waves throughwitli'the apex of the amplifier as shown in 'discharge them circumfrentially into the atas an amplifier, but my ampli producing device in communication with them' I5 ten fier proper is shown distinct therefrom. inlet end of the amplifier. i This? consists oftwo approximately bell j 2. In a talking machine, an amplifier com- '40.shaped"shells' corresponding to. each other ,prising a double walled horn ;.providing a p injfsh'ape and arrangement, and located, one sound space between the walls, a tone arm 95' within the other, "hereby they form "a connected directly to the double walled porcorresponding sound amplifying space, 'tion at the inletend of the amplifier,.the throughout the whole extent ofthe amplifier discharge end of the walls being open for from'inlet toiexit, and exclusively control the emission of the sound waves circumfer ling the sound .waves in. the space between entially of the amplifier, substantially as de- 100 thewalls to flthei" final discharge into the scribed. v atmosphere. Further, sound amplify; 3. In combination with a cabinet, anami'ng' space (of corresponding approximately plifier located therein having double walls 7 S'Obell shape) increases toward the exitin two and of hell shape, the upper end of the rm-1 dimensions; first-'in thickness, that is to say, .plifier being arranged substantially ,'c en,l05 in distance between the walls, and also in trally of the cabinet, and the lower en'df 'of general diameter, or across the bell. Tltb the bell -'extending peripherally around "the outer shell is supported on a horizontal wallifbase 'and opening into the room, and atone.

for 'lalking-hflachines, of which the followand position, from inlet to outlet of the i- 0' at K: The lower fixed part is connected but the entire length of the amplifier and to Fig: 1%; This'tone arfh, as usual, may act to 'niosphere in combination with the sound arm directly connected to the double walled portion of the amplifier at the inlet end, substantially as described.

4. In a talking machine, a cabinet, a double walled amplifier arranged within the cabinet and intermediate of the top and bottom thereof, driving means located beneath the lower wall of the amplifier whereby its sound is mufiled, an axial shaft therefrom and a turn table thereon above said ampli- 10 fier, and a tone arm connected .to'theam plifier, substantially as described.

In testimony whereof, I affix my signature in presence of two witnesses.

JAMES M. EVQNS. Witnesses:

F. L. MIDDLETON,

EDWIN S. CLARKSON. 

